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ternal references as a percentage of the actual refer-
ence.
In addition, it is possible to use parameter 308 to select
whether the signals on terminals 54 and 60 are to be
added to the sum of the active references.
If
External/preset
[2] is selected, it is possible to shift
between external references or preset references via
terminal 16, 17, 29, 32 or 33 (parameter 300, 301, 305,
306 or 307). Preset references will be a percentage
value of the reference range.
External reference is the sum of the analog references,
pulses and bus references. See also drawings in sec-
tion
Handling of multi-references
.
NOTE
If
Sum
or
Relative
is selected, one of the
preset references will always be active. If
the preset references are to be without in-
fluence, they should be set to 0 % (as in
the factory setting).
The example shows how to calculate the output fre-
quency if using
Preset references
together with
Sum
and
Relative
in parameter 214.
Parameter 205
Maximum reference
has been set to 50
Hz.
Par. 204
Min. reference
Increase
[Hz/V]
Frequency
by 4.0 V
Par. 215
Preset ref.
Par. 214 Reference
type =
Sum
[0]
Par. 214 Reference
type =
Relative
[1]
1)
0
5
20 Hz
15 %
Output frequency
Output frequency
00+20+7.5 = 27.5 Hz
00+20+3 = 23.0 Hz
2)
10
4
16 Hz
15 %
10+16+6.0 = 32.0 Hz
10+16+2.4 = 28.4 Hz
3)
20
3
12 Hz
15 %
20+12+4.5 = 36.5 Hz
20+12+1.8 = 33.8 Hz
4)
30
2
8 Hz
15 %
30+8+3.0 = 41.0 Hz
30+8+1.2 = 39.2 Hz
5)
40
1
4 Hz
15 %
40+4+1.5 = 45.5 Hz
40+4+0.6 = 44.6 Hz
215
Preset reference 1 (PRESET REF. 1)
216
Preset reference 2 (PRESET REF. 2)
217
Preset reference 3 (PRESET REF. 3)
218
Preset reference 4 (PRESET REF. 4)
Value:
-100.00 % - +100.00 %
0.00%
of the reference range/ex-
ternal reference
Function:
Four different preset references can be programmed
in parameters 215-218.
The preset reference is stated as a percentage of the
value Ref
MAX
or as a percentage of the other external
references, depending on the choice made in param-
eter 214. If a Ref
MIN
• 0 has been programmed, the
preset reference as a percentage will be calculated on
the basis of the difference between Ref
MAX
and
Ref
MIN
, following which the value is added to Ref
MIN
.
Description of choice:
Set the fixed reference(s) that is/are to be the options.
To use the fixed references, it is necessary to have
selected Preset ref. enable on terminal 16, 17, 29, 32
or 33.
Choices between fixed references can be made by
activating terminal 16, 17, 29, 32 or 33 - see the table
below.
VLT
®
5000 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
104
MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
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Страница 196: ...RELATIVE VLT 5000 Series MG 51 C5 22 VLT p is a registered Danfoss trademark 193 List of functions ...
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